<?php

/**
 * OpenID protocol key-value/comma-newline format parsing and
 * serialization
 *
 * PHP versions 4 and 5
 *
 * LICENSE: See the COPYING file included in this distribution.
 *
 * @access private
 * @package OpenID
 * @author JanRain, Inc. <openid@janrain.com>
 * @copyright 2005-2008 Janrain, Inc.
 * @license http://www.apache.org/licenses/LICENSE-2.0 Apache
 */

// Do not allow direct access
defined( '_JEXEC' ) or die( 'Restricted access' );

/**
 * Container for key-value/comma-newline OpenID format and parsing
 */
class Auth_OpenID_KVForm {
	/**
	 * Convert an OpenID colon/newline separated string into an
	 * associative array
	 *
	 * @static
	 * @access private
	 */
	function toArray($kvs, $strict=false)
	{
		$lines = explode("\n", $kvs);

		$last = array_pop($lines);
		if ($last !== '') {
			array_push($lines, $last);
			if ($strict) {
				return false;
			}
		}

		$values = array();

		for ($lineno = 0; $lineno < count($lines); $lineno++) {
			$line = $lines[$lineno];
			$kv = explode(':', $line, 2);
			if (count($kv) != 2) {
				if ($strict) {
					return false;
				}
				continue;
			}

			$key = $kv[0];
			$tkey = trim($key);
			if ($tkey != $key) {
				if ($strict) {
					return false;
				}
			}

			$value = $kv[1];
			$tval = trim($value);
			if ($tval != $value) {
				if ($strict) {
					return false;
				}
			}

			$values[$tkey] = $tval;
		}

		return $values;
	}

	/**
	 * Convert an array into an OpenID colon/newline separated string
	 *
	 * @static
	 * @access private
	 */
	function fromArray($values)
	{
		if ($values === null) {
			return null;
		}

		ksort($values);

		$serialized = '';
		foreach ($values as $key => $value) {
			if (is_array($value)) {
				list($key, $value) = array($value[0], $value[1]);
			}

			if (strpos($key, ':') !== false) {
				return null;
			}

			if (strpos($key, "\n") !== false) {
				return null;
			}

			if (strpos($value, "\n") !== false) {
				return null;
			}
			$serialized .= "$key:$value\n";
		}
		return $serialized;
	}
}

?>